Answer:
7x+7
2y+5
6x^2+3y
5a^3+4a^2+3a (This one is the same because none of the terms are alike)
11x
5x+7
10x-9y
5x+5y
x^2+6x
4x+4
Explanation:
Combine like terms for all of these, meaning adding or subtracting anything that has the same variable or power of a variable attached to it.